What is the most recent common ancestor of Triceratops and modern birds?

I read that the definition of the dinosaurs was an animal as the Triceratops, modern birds, their most recent common ancestor and all its descendants, but only that this animal is the most recent common ancestor? Does anyone know …?

Thecondont probably a reptile that is more primitive than the late Triassic Longisquama. From Longisquama has feathers, but dinosaurs it does not, the common ancestor of Triceratops lived Longisquama and probably not until the mid to late Triassic, before dinosaurs evolved. One problem with this kind of definition of "dinosaur" is that is constantly changing, and there is no way to determine if a new species fits the definition or not. By Conversely, a taxon as Diapsida can be easily defined by the position and number of openings in the skull, among other things, and is fairly easy to determine if a new species is a disapsid or not in most cases. Another problem is the definition of dinosaur may be the same as Archosauria, so as Postosuchus thecodonts and Longisquama would be considered "dinosaurs."

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